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COMMITMENTS AND CONTINGENCIES - (Narrative) (Details) - USD ($)
$ in Thousands
May 07, 2025
Mar. 31, 2025
Dec. 31, 2024
Other Commitments [Line Items]      
Asset retirement obligation   $ 37,541 $ 44,117
Subsequent Event      
Other Commitments [Line Items]      
Loss Contingency, Damages Sought, Value $ 4,600    
Loss Contingency, Damages Paid, Value 1,400    
Loss Contingency, Damages Held In Escrow, Value $ 3,200    
Mining Properties and Mineral Rights      
Other Commitments [Line Items]      
Renewal costs   1,790  
Canyon Project      
Other Commitments [Line Items]      
Loss contingency, estimate of possible loss   20,180 20,000
Asset retirement obligation   $ 67,980 $ 74,270